diff --git a/OAuth2-Backend-Approach.md b/OAuth2-Backend-Approach.md
index fea8011..a2f5122 100644
--- a/OAuth2-Backend-Approach.md
+++ b/OAuth2-Backend-Approach.md
@@ -84,9 +84,9 @@ Content-Type: application/x-www-form-urlencoded
 
 grant_type=authorization_code&
 code=AAAABCX4XfWgyVyziyLg0QHHHHH&
-redirect_uri=https://xorismesiti.gr/callback&
 client_id=ABC34JHS9D&
-client_secret=PASS1234
+client_secret=PASS1234&
+redirect_uri=https://xorismesiti.gr/callback
 ```
 
 ### 2. Google **response** to Backend
@@ -102,7 +102,7 @@ client_secret=PASS1234
 }
 ```
 
-### 3. Backend **response** to Frontend
+### 3. Backend **response** to Frontend (for the initial request to Google)
 
 ```json
 {
@@ -113,7 +113,18 @@ client_secret=PASS1234
 ```
 
 <details>
-<summary><h4>Backend code</h4></summary>
+<summary>
+  <h4>Backend code</h4>
+  <br><br>
+  <p>Implements the endpoint /auth/google/callback</p>
+  <br>
+  <ul>
+    <li>Recieves authorization code from Google</li>
+    <li>POST send    : authorization code to https://oauth2.googleapis.com/token</li>
+    <li>POST reqponse: access & refresh tokens</li>
+    <li>Respond the Fronend initial request with a cookie</li>
+  </ul>
+</summary>
 
 ```js
 // Backend callback URL: http://localhost:3000/auth/google/callback